Go here>> http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/SC-CME256_pm.pdf
HINT: I looked at page 19. From that, I'm fairly certain I know what the problem is.
Took me about five minutes to determine that. I advise tapping into your technical resources. There never before was a day like this day-in-age to have them so readily accessible.
Thanks for the response, I assume you are saying the board is not shutting down the fan, the board work fine other wise , what do you think about putting in a double pole contactor?
I never recommend redesigning equipment. Scotsman engineered it the way they did. If a part fails, I recommend OEM parts. General purpose items, YES, when it meets the same specs. Circumventing the failings of the main controller - NO.
If you redesign it, then you own it's problems in the future.
That's merely my recommendation.
Did you check for a fan cycle control if any, if it has one it may be stuck closed. I assume you referring to the condenser fan
koolrider, according to Scotman's tech manual, they only used a fan cycle control switch in CME256 units up until Aug 1996. Since it's a self-contained unit operating in a regulated indoor environment, I suspect they eliminated the the fan cycle control from their design. The unit has no means for monitoring system pressure. As such, the electronic controller merely turns the condenser fan off during the harvest cycle. So, the controller IS the fan cycle control - initiated by the harvest cycle.
The problem here will be that the condenser fan control circuit in the controller is shorted, thereby causing the fan to run continuously - even with the unit turned OFF.
Most likely the fan relay is stuck closed. Lightly tapping on the relays on the control board with the butt of a screwdriver, and do mean LIGHTLY, sometimes frees the relay contacts. otherwise a new board will is in order.
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